/* apps/dsa.c */

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * The implementation was written so as to conform with Netscapes SSL.

 * 

 * This library is free for commercial and non-commercial use as long as

 * the following conditions are aheared to.  The following conditions

 * apply to all code found in this distribution, be it the RC4, RSA,

 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

 * included with this distribution is covered by the same copyright terms

 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

 * 

 * Copyright remains Eric Young's, and as such any Copyright notices in

 * the code are not to be removed.

 * If this package is used in a product, Eric Young should be given attribution

 * as the author of the parts of the library used.

 * This can be in the form of a textual message at program startup or

 * in documentation (online or textual) provided with the package.

 * 

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *    "This product includes cryptographic software written by

 *     Eric Young (eay@cryptsoft.com)"

 *    The word 'cryptographic' can be left out if the rouines from the library

 *    being used are not cryptographic related :-).

 * 4. If you include any Windows specific code (or a derivative thereof) from 

 *    the apps directory (application code) you must include an acknowledgement:

 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

 * 

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 * 

 * The licence and distribution terms for any publically available version or

 * derivative of this code cannot be changed.  i.e. this code cannot simply be

 * copied and put under another distribution licence

 * [including the GNU Public Licence.]

 */

#include <openssl/opensslconf.h>	/* for OPENSSL_NO_DSA */

#ifndef OPENSSL_NO_DSA

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <time.h>

#include "apps.h"

#include <openssl/bio.h>

#include <openssl/err.h>

#include <openssl/dsa.h>

#include <openssl/evp.h>

#include <openssl/x509.h>

#include <openssl/pem.h>

#include <openssl/bn.h>

#undef PROG

#define PROG	dsa_main

/* -inform arg	- input format - default PEM (one of DER, NET or PEM)

 * -outform arg - output format - default PEM

 * -in arg	- input file - default stdin

 * -out arg	- output file - default stdout

 * -des		- encrypt output if PEM format with DES in cbc mode

 * -des3	- encrypt output if PEM format

 * -idea	- encrypt output if PEM format

 * -aes128	- encrypt output if PEM format

 * -aes192	- encrypt output if PEM format

 * -aes256	- encrypt output if PEM format

 * -text	- print a text version

 * -modulus	- print the DSA public key

 */

int MAIN(int, char **);

int MAIN(int argc, char **argv)

	{

#ifndef OPENSSL_NO_ENGINE

	ENGINE *e = NULL;

#endif

	int ret=1;

	DSA *dsa=NULL;

	int i,badops=0;

	const EVP_CIPHER *enc=NULL;

	BIO *in=NULL,*out=NULL;

	int informat,outformat,text=0,noout=0;

	int pubin = 0, pubout = 0;

	char *infile,*outfile,*prog;

#ifndef OPENSSL_NO_ENGINE

	char *engine;

#endif

	char *passargin = NULL, *passargout = NULL;

	char *passin = NULL, *passout = NULL;

	int modulus=0;

	apps_startup();

	if (bio_err == NULL)

		if ((bio_err=BIO_new(BIO_s_file())) != NULL)

			BIO_set_fp(bio_err,stderr,BIO_NOCLOSE|BIO_FP_TEXT);

	if (!load_config(bio_err, NULL))

		goto end;

#ifndef OPENSSL_NO_ENGINE

	engine=NULL;

#endif

	infile=NULL;

	outfile=NULL;

	informat=FORMAT_PEM;

	outformat=FORMAT_PEM;

	prog=argv[0];

	argc--;

	argv++;

	while (argc >= 1)

		{

		if 	(strcmp(*argv,"-inform") == 0)

			{

			if (--argc < 1) goto bad;

			informat=str2fmt(*(++argv));

			}

		else if (strcmp(*argv,"-outform") == 0)

			{

			if (--argc < 1) goto bad;

			outformat=str2fmt(*(++argv));

			}

		else if (strcmp(*argv,"-in") == 0)

			{

			if (--argc < 1) goto bad;

			infile= *(++argv);

			}

		else if (strcmp(*argv,"-out") == 0)

			{

			if (--argc < 1) goto bad;

			outfile= *(++argv);

			}

		else if (strcmp(*argv,"-passin") == 0)

			{

			if (--argc < 1) goto bad;

			passargin= *(++argv);

			}

		else if (strcmp(*argv,"-passout") == 0)

			{

			if (--argc < 1) goto bad;

			passargout= *(++argv);

			}

#ifndef OPENSSL_NO_ENGINE

		else if (strcmp(*argv,"-engine") == 0)

			{

			if (--argc < 1) goto bad;

			engine= *(++argv);

			}

#endif

		else if (strcmp(*argv,"-noout") == 0)

			noout=1;

		else if (strcmp(*argv,"-text") == 0)

			text=1;

		else if (strcmp(*argv,"-modulus") == 0)

			modulus=1;

		else if (strcmp(*argv,"-pubin") == 0)

			pubin=1;

		else if (strcmp(*argv,"-pubout") == 0)

			pubout=1;

		else if ((enc=EVP_get_cipherbyname(&(argv[0][1]))) == NULL)

			{

			BIO_printf(bio_err,"unknown option %s\n",*argv);

			badops=1;

			break;

			}

		argc--;

		argv++;

		}

	if (badops)

		{

bad:

		BIO_printf(bio_err,"%s [options] <infile >outfile\n",prog);

		BIO_printf(bio_err,"where options are\n");

		BIO_printf(bio_err," -inform arg     input format - DER or PEM\n");

		BIO_printf(bio_err," -outform arg    output format - DER or PEM\n");

		BIO_printf(bio_err," -in arg         input file\n");

		BIO_printf(bio_err," -passin arg     input file pass phrase source\n");

		BIO_printf(bio_err," -out arg        output file\n");

		BIO_printf(bio_err," -passout arg    output file pass phrase source\n");

#ifndef OPENSSL_NO_ENGINE

		BIO_printf(bio_err," -engine e       use engine e, possibly a hardware device.\n");

#endif

		BIO_printf(bio_err," -des            encrypt PEM output with cbc des\n");

		BIO_printf(bio_err," -des3           encrypt PEM output with ede cbc des using 168 bit key\n");

#ifndef OPENSSL_NO_IDEA

		BIO_printf(bio_err," -idea           encrypt PEM output with cbc idea\n");

#endif

#ifndef OPENSSL_NO_AES

		BIO_printf(bio_err," -aes128, -aes192, -aes256\n");

		BIO_printf(bio_err,"                 encrypt PEM output with cbc aes\n");

#endif

		BIO_printf(bio_err," -text           print the key in text\n");

		BIO_printf(bio_err," -noout          don't print key out\n");

		BIO_printf(bio_err," -modulus        print the DSA public value\n");

		goto end;

		}

	ERR_load_crypto_strings();

#ifndef OPENSSL_NO_ENGINE

        e = setup_engine(bio_err, engine, 0);

#endif

	if(!app_passwd(bio_err, passargin, passargout, &passin, &passout)) {

		BIO_printf(bio_err, "Error getting passwords\n");

		goto end;

	}

	in=BIO_new(BIO_s_file());

	out=BIO_new(BIO_s_file());

	if ((in == NULL) || (out == NULL))

		{

		ERR_print_errors(bio_err);

		goto end;

		}

	if (infile == NULL)

		BIO_set_fp(in,stdin,BIO_NOCLOSE);

	else

		{

		if (BIO_read_filename(in,infile) <= 0)

			{

			perror(infile);

			goto end;

			}

		}

	BIO_printf(bio_err,"read DSA key\n");

	if	(informat == FORMAT_ASN1) {

		if(pubin) dsa=d2i_DSA_PUBKEY_bio(in,NULL);

		else dsa=d2i_DSAPrivateKey_bio(in,NULL);

	} else if (informat == FORMAT_PEM) {

		if(pubin) dsa=PEM_read_bio_DSA_PUBKEY(in,NULL, NULL, NULL);

		else dsa=PEM_read_bio_DSAPrivateKey(in,NULL,NULL,passin);

	} else

		{

		BIO_printf(bio_err,"bad input format specified for key\n");

		goto end;

		}

	if (dsa == NULL)

		{

		BIO_printf(bio_err,"unable to load Key\n");

		ERR_print_errors(bio_err);

		goto end;

		}

	if (outfile == NULL)

		{

		BIO_set_fp(out,stdout,BIO_NOCLOSE);

#ifdef OPENSSL_SYS_VMS

		{

		BIO *tmpbio = BIO_new(BIO_f_linebuffer());

		out = BIO_push(tmpbio, out);

		}

#endif

		}

	else

		{

		if (BIO_write_filename(out,outfile) <= 0)

			{

			perror(outfile);

			goto end;

			}

		}

	if (text) 

		if (!DSA_print(out,dsa,0))

			{

			perror(outfile);

			ERR_print_errors(bio_err);

			goto end;

			}

	if (modulus)

		{

		fprintf(stdout,"Public Key=");

		BN_print(out,dsa->pub_key);

		fprintf(stdout,"\n");

		}

	if (noout) goto end;

	BIO_printf(bio_err,"writing DSA key\n");

	if 	(outformat == FORMAT_ASN1) {

		if(pubin || pubout) i=i2d_DSA_PUBKEY_bio(out,dsa);

		else i=i2d_DSAPrivateKey_bio(out,dsa);

	} else if (outformat == FORMAT_PEM) {

		if(pubin || pubout)

			i=PEM_write_bio_DSA_PUBKEY(out,dsa);

		else i=PEM_write_bio_DSAPrivateKey(out,dsa,enc,

							NULL,0,NULL, passout);

	} else {

		BIO_printf(bio_err,"bad output format specified for outfile\n");

		goto end;

		}

	if (!i)

		{

		BIO_printf(bio_err,"unable to write private key\n");

		ERR_print_errors(bio_err);

		}

	else

		ret=0;

end:

	if(in != NULL) BIO_free(in);

	if(out != NULL) BIO_free_all(out);

	if(dsa != NULL) DSA_free(dsa);

	if(passin) OPENSSL_free(passin);

	if(passout) OPENSSL_free(passout);

	apps_shutdown();

	OPENSSL_EXIT(ret);

	}

#endif